pmem.h

 1/* SPDX-License-Identifier: GPL-2.0 */
 2#ifndef __NVDIMM_PMEM_H__
 3#define __NVDIMM_PMEM_H__
 4#include <linux/page-flags.h>
 5#include <linux/badblocks.h>
 6#include <linux/memremap.h>
 7#include <linux/types.h>
 8#include <linux/fs.h>
 9
10enum dax_access_mode;
11
12/* this definition is in it's own header for tools/testing/nvdimm to consume */
13struct pmem_device {
14	/* One contiguous memory region per device */
15	phys_addr_t		phys_addr;
16	/* when non-zero this device is hosting a 'pfn' instance */
17	phys_addr_t		data_offset;
18	void			*virt_addr;
19	/* immutable base size of the namespace */
20	size_t			size;
21	/* trim size when namespace capacity has been section aligned */
22	u32			pfn_pad;
23	struct kernfs_node	*bb_state;
24	struct badblocks	bb;
25	struct dax_device	*dax_dev;
26	struct gendisk		*disk;
27	struct dev_pagemap	pgmap;
28};
29
30long __pmem_direct_access(struct pmem_device *pmem, pgoff_t pgoff,
31		long nr_pages, enum dax_access_mode mode, void **kaddr,
32		unsigned long *pfn);
33
34#ifdef CONFIG_MEMORY_FAILURE
35static inline bool test_and_clear_pmem_poison(struct page *page)
36{
37	return TestClearPageHWPoison(page);
38}
39#else
40static inline bool test_and_clear_pmem_poison(struct page *page)
41{
42	return false;
43}
44#endif
45#endif /* __NVDIMM_PMEM_H__ */